CN2580535Y - Voltage signal modulation circuit - Google Patents
Voltage signal modulation circuit Download PDFInfo
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- CN2580535Y CN2580535Y CN 02285976 CN02285976U CN2580535Y CN 2580535 Y CN2580535 Y CN 2580535Y CN 02285976 CN02285976 CN 02285976 CN 02285976 U CN02285976 U CN 02285976U CN 2580535 Y CN2580535 Y CN 2580535Y
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Abstract
The utility model relates to a voltage signal modulation circuit. The voltage signal modulation circuit is composed of a voltage mutual inductance sampling, amplifying and boosting circuit, an A/D collecting circuit, a single-chip microcomputer processing circuit, a D/A conversion circuit, a V/I conversion circuit, a reference circuit and a power circuit. The voltage signal modulation circuit measures 0-500 VAC voltage signals, 0-2 mA AC signals can be obtained at the auxiliary side of a voltage transformer after the 0-500 VAC voltage signals pass through the 0-500 VAC voltage signals, 0-1.2 VAC signals can be obtained after the 0-2 mA AC signals are sampled by resistors, and the 0-1.2 VAC signals are processed by rear circuits; a 4-path 8-bit A/D unit is arranged in a PIC16F73 single chip computer, the 0-1.2 VAC signals are processed by the methods of amplification and voltage boosting by the 4-path 8-bit A/D unit and then sent to an A/D passage in which the 0-1.2 VAC signals are converted into digital signals which are delivered, and the digital signals are delivered into an 8-bit D/A converter TLV5620 and converted into DC voltage signals which are converted by the V/I conversion circuit to output 4-20 mA DC current signals. The voltage signal modulation circuit has the advantages of transient protection, high measuring precision and high reliability.
Description
Technical field
The utility model relates to a kind of modulate circuit, be meant a kind of industrial process automation control terminal that is used for especially, nurse one's health into the voltage signal modulate circuit of standard signal in order to the ac voltage signal that the scene is provided, gather for simulated measurement input circuit, at any time monitor the fluctuating of field control power devices voltage, thereby the normal operation of the equipment of assurance, be particularly suitable for petrochemical industry, plumbing, electric power, the industrial process automation control terminal in fields such as metallurgy is measured ac voltage signal, voltage signal is converted to 4～20mA current signal passes to simulated measurement input circuit, finish the measurement and the demonstration of current signal.
Background technology
At present, be applied in the opertaing device of industrial automation field the individual event voltage signal of input is nursed one's health into the circuit of standard signal in China, because circuit design is simple, when design, do not consider to reduce effect and the destruction of on-the-spot undesired signal to circuit yet, cause that individual event voltage transitions signal errors is big, output is unstable, measurement data is inaccurate, cause very big influence for whole automation control system, in addition, can not return to zero, transfer full scale according to on-site actual situations, bring very big inconvenience to practical operation.
Summary of the invention
The purpose of this utility model is to avoid above-mentioned weak point of the prior art and a kind of voltage signal modulate circuit that is used for the robotization control terminal of proposing, it can be simultaneously with one road ac voltage signal (0-500VAC), convert the 4-20mA dc current signal of standard to, measuring accuracy height not only, be more suitable for regulating, made things convenient for practical operation according to actual conditions.
The purpose of this utility model can reach by following measure:
A kind of voltage signal modulate circuit that is used for the robotization control terminal, this circuit is made up of mutual induction of voltage sampling, amplification, booster circuit, A/D Acquisition Circuit, single-chip microcomputer treatment circuit, D/A change-over circuit, V/I change-over circuit, reference circuit,
The concrete connection of its circuit is as follows:
At the former limit of mutual inductor T1 resistance in series R21, the in parallel two-way transition of mutual inductor secondary suppresses diode CR1 and sampling resistor R1, secondary one end ground connection, the non-earth terminal of secondary inserts amplifier U5B MXL1013 negative input end by resistance R 2, insert the output terminal of U5B and the pipe leg 2 of single-chip microcomputer U6PIC16F73 by resistance R 3 simultaneously, reference voltage 5Vref is connected on the positive input terminal of U5B and arrives ground by resistance R 5 through divider resistance R4;
Connect the pipe leg 7 of the chip U8 X5043 that resets at the reseting pin 1 of single-chip microcomputer, a low level reset signal is provided, insert power supply VCC by pull-up resistor R6 simultaneously, pipe leg 1,4,5,6 ground connection, pipe leg 3,8 meets power supply VCC;
The pipe leg 5 of single-chip microcomputer U6 PIC16F73 meets reference voltage 5Vref, pipe leg 8 ground connection, pipe leg 9,10 connects crystal Y1 and two oscillatory circuits that capacitor C 4, C5 form, pipe leg 20 meets power supply VCC, pipe leg 19 ground connection, 19,20 shunt capacitance C6 of pipe leg, pipe leg 14,16 inserts power supply VCC by pull-up resistor R10, R11 respectively, and pipe leg 12,13,14,16 connects the pipe leg 13,8,7,6 of D/A conversion chip U7 respectively;
The pipe leg 14 of D/A conversion chip U7 meets power supply VCC, pipe leg 1 ground connection, and 1,14 shunt capacitance C7 of pipe leg, reference voltage 5Vref connect the resistance R 8, R9 of series connection to ground, and its mid point connects the pipe leg 2,3,4,5 of D/A conversion chip U7;
The pipe leg 12 of D/A conversion chip U7 connects the resistance R 12 of series connection, potentiometer W6, resistance R 22, capacitor C 9 is to ground, reference voltage 5Vref meets the potentiometer WZ of polyphone, the zeroing circuit that resistance R 13 is formed is to the tie point of potentiometer W6 and resistance R 22, the negative input end of U9A and connect operational amplifier U9A output terminal by resistance R 14, the positive input terminal ground connection of U9A,-15V is by the dropping resistor R24 of polyphone, R22 is to ground, R24, the R22 tie point and+15V provides voltage to U9A respectively, the output terminal of U9A connects the negative input end of U9B and passes through parallel resistor R17 by resistance R 15, capacitor C 8, connect the output terminal of U9B again with resistance R 9 polyphones, the output terminal of U9B connects the output terminal of electric current 4～20mA by resistance R 20, the output terminal of electric current 4～20mA is by the resistance R 18 of polyphone, R16 ground connection, resistance R 18, the tie point of R16 connects the positive input terminal of U9B.
The utility model has following advantage compared to existing technology:
This is used for the voltage signal modulate circuit of robotization control terminal, this circuit adopts the power supply of 24VDC power supply, what gather is one road 0-500V ac voltage signal, is output as standard 4-20mA direct current signal, and output signal can be delivered to controller by the simulated measurement input circuit collection and handle; This circuit has been made module, and is quick and easy for installation; Entire circuit also provides ± the 6V protection from transients; Measuring accuracy is normal temperature ± 1.5% at normal temperatures, omnidistance temperature range ± 3%; Because what the utility model adopted all is the technical grade components and parts, adaptable temperature range is-40 ℃～70 ℃, can work than under the rugged environment.
Description of drawings
Fig. 1. voltage signal modulate circuit figure;
Fig. 2. voltage signal modulate circuit program flow diagram.
Embodiment
Please refer to Fig. 1 voltage signal modulate circuit figure, the purpose of this circuit is to measure the 0-500VAC voltage signal.Used voltage transformer (VT) to receive voltage signal in the porch of circuit, the resistance of having connected on the former limit of mutual inductor, make secondary can obtain the 0-2mA ac current signal, we carry out resistance sampling again and can obtain the 0-1.2VAC signal for the back processing of circuit to this signal.
Gather voltage signal and signal is handled, used the PIC16F73 single-chip microcomputer in the circuit, built-in 4 tunnel 8 A/D of this single-chip microcomputer.The 0-1.2V AC signal amplified and boost and send into these A/D passages after handling, become digital signal and send through handling.
Digital signal is sent into 8 D/A converter TLV5620 and is changed d. c. voltage signal into, and through the dc current signal of V/I change-over circuit output 4-20mA, this current signal can be with the load about 700 Ω again.
This circuit is made up of mutual induction of voltage sampling, amplification, booster circuit, A/D Acquisition Circuit, single-chip microcomputer treatment circuit, D/A change-over circuit, V/I change-over circuit, reference circuit, power circuit, now each several part is described.
Mutual induction of voltage sampling, amplification, booster circuit:
Two-way transition suppresses diode CR1 and sampling resistor R1 through mutual inductor T1 6V in parallel at input end, wherein diode is in order to reduce effect and the destruction of undesired signal to circuit, the secondary output 0-2mA alternating current of T1, R1 is a sampling resistor, produce the 0-1.2V alternating voltage, input end inserts amplifier U5 MXL1013 negative input end by resistance R 2, inserts the output terminal of U5 simultaneously by resistance R 3; Because this signal is in below the zero potential by a part, so the signal overall waveform need be risen on the zero potential, adopt in the circuit 5V reference voltage through branch the anode that is crimped on amplifier with signal boost to the zero point current potential, signal is delivered in the circuit of back through amplifying then.The output terminal of U5 inserts the pipe leg A0 of single-chip microcomputer U6 PIC16F73.
The A/D Acquisition Circuit:
8 A/D translation functions having used single-chip microcomputer U6 PIC16F73 to carry in the circuit.This A/D converter is to adopt successive approximation method to carry out digital-to-analog conversion, and its analog voltage reference available software programming is selected, and can be the positive voltage Vdd of chip, also can be from impressed voltage value on the Vref pin, and this circuit adopts and adds reference voltage.The pipe leg A3 of single-chip microcomputer U6 inserts 5Vref, Vss pipe leg ground connection, and a crystal Y1 in parallel and two capacitor C 4, C5 ground connection between its pipe leg 9,10, the oscillatory circuit of formation is for the unit sheet provides frequency of operation.Pipe leg C1, C2, SCL, C5 insert pipe leg LDAC, LOAD, CLK, the DATA of D/A conversion chip respectively, and wherein pipe leg SCL, the C5 of single-chip microcomputer insert power supply VCC by pull-up resistor, and making it is high level when not having signal; Pipe leg Vdd inserts power supply VCC, by filter capacitor C6 ground connection, and pipe leg Vss ground connection; Obtain a reliable reset signal in order to power up, reseting pin at single-chip microcomputer connects chip U8 X5043, it can be single-chip microcomputer a low level reset signal is provided when powering up, pipe leg Vpp inserts the pipe leg RST of the chip U8 X5043 that resets, inserts power supply VCC by pull-up resistor R6 simultaneously.
The D/A change-over circuit:
Used D/A conversion chip U7 TLV5620 in the circuit, its pipe leg VCC inserts the 5V power supply, by capacitor C 7 ground connection, and pipe leg GND ground connection; It provides four tunnel 8 D/A conversions, is output as d. c. voltage signal.The needs of this circuit needs one tunnel conversions have been satisfied.The pipe leg REFA of U7, REFB, REFC, REFD insert 5Vref by resistance R 8 respectively, simultaneously by pull down resistor R9 ground connection; U7 provides the SPI interface of standard, carries out the design that interface has been simplified circuit and program with the SPI of it and single-chip microcomputer PIC16F73; DACA inserts the V/I change-over circuit by the anti-phase totalizer of being made up of resistance, potentiometer, operational amplifier by the pipe leg.
The V/I change-over circuit:
Can regulate zero point and full scale by regulator potentiometer in circuit, wherein label is that the potentiometer of Wz is when being input as zero, and zero point is regulated in output; The potentiometer of label Wg is when being input as 500VAC, and full scale is regulated in output.Vref is the 5V reference voltage, 5Vref inserts the negative input end of transport and placing device U9A by zeroing circuit, be both by series connection rc filter circuit ground connection, its positive input terminal ground connection, provide ± 15V voltage for it by power circuit, D/A conversion chip U7 pipe leg 12DACA inserts the negative input end of U9A by transferring the full scale circuit, the 0-5V signal of D/A output wherein, by the voltage signal of D/A output and reference signal through obtain-0.2 after the anti-phase totalizer～-voltage signal of 1V.Be output as the standard output current of 4-20mA behind this voltage signal process V/I change-over circuit.The V/I change-over circuit connects as follows: the output terminal of U9A inserts the negative input end of operational amplifier U9B by resistance, insert output terminal OUT by a resistance behind the output terminal by a rc filter circuit in parallel and a resistance access U9B simultaneously, the positive input terminal of U9B meets output terminal OUT through a resistance simultaneously by pull down resistor ground connection.
Reference circuit:
Circuit has used the 5V voltage of fiducial chip U2 REF02 generation as reference voltage, because being arranged in the circuit, many places use reference voltage, consider its load capacity problem, add incident level follower MXL1013 at the 5V output, improve the load capacity of 5V, this is penetrated grade follower and is provided ± 15V voltage for it by power circuit.
Power circuit:
This circuit adopts the 24VDC power supply since need in the circuit 5V and ± 15V voltage, this just need carry out change in voltage in circuit.Processor and D/A circuit need the 5V power supply in the circuit, use so use LM2575-5.0 switching regulator voltage conversion device to change 24V into 5V power supply road.For preventing that power supply from connecing instead, at the series diode CR2 of power import place; Simultaneously in order to prevent power supply misconnection high pressure, suppress diode CR3 in power input transition in parallel, the 24V power supply inserts the pipe leg VIN of U1 by CR2, at a VIN end electrochemical capacitor E1 in parallel with earth terminal, and shunt capacitance C1 between the pipe leg ON/OFF, voltage output end OUT is by inductance L 1 output 5V voltage, a diode electrically CR4 in parallel and an electrochemical capacitor E2 respectively between the two ends of inductance L 1 and ground.
Reference circuit, amplifying circuit and V/I circuit needs ± 15V power supply use three terminal regulator U37815 24V to be changed into+15V earlier, use U4 7662 general+15V oppositely to obtain-15V voltage then.
Please refer to Fig. 2 voltage signal modulate circuit program flow diagram, because SPI interface and A/D interface that single-chip microcomputer PIC16F73 carries make program design become very simple.Only need consider to gather which type of numerical value when program design can reflect input state and how carry out software filtering.A/D input be the voltage signal of 50Hz, can represent the state imported as long as collect its peak-to-peak value, and according to peak-to-peak value decision output.Each 255 points of continuous acquisition in the program, the acquisition time of each point is that whole acquisition time is 25ms about 100 μ S, 20ms has more 5ms than the signal period, therefrom obtains minimum value and maximal value, and calculates the peak-to-peak value of signal.
Software is to adopt the algorithm that the peak-to-peak value that collects is carried out moving average filter, in order to guarantee the stability of output.
This is used for the voltage signal modulate circuit of robotization control terminal, has made module, and our factory's numbering and name are called E305B voltage conditioning module.
Voltage signal conditioning module physical dimension is: (length) 118mm * (wide) 108mm * (height) 44mm, adopt ECHOB pattern piece encapsulating housing.Be installed on the DIN guide rail of 7.5mm * 35mm, output signal can directly be gathered by the analog quantity load module.
The E305B module adopts the power supply of 24VDC power supply, collection be the 0-500VAC voltage signal, be output as standard 4-20mA direct current signal.Output signal can be delivered to controller with the collection of analog quantity load module and handle.
Module uses connection terminal to be connected with peripheral circuit, and wherein two terminals are the input of 0-500VAC power supply; Two terminals are the input of 24VDC power supply, and two-way is the 4-20mA signal output part.Recommend to use the standard wire of 22～12AWG.
The E305B module is applicable to and offers the fluctuating of the alternating voltage of opertaing device with measurement in the various control terminals, thereby judges whether its voltage input is normal, is used to protect opertaing device.Rig-site utilization shows, E303B current regulating module has applying flexible, precision height, reliability height, characteristics such as easy to install and can be applicable to-40 ℃～70 ℃ environment temperature.Be applicable to open-air abominable industry spot environment.
Claims (1)
1. voltage signal modulate circuit that is used for the robotization control terminal, it is characterized in that: this circuit is made up of mutual induction of voltage sampling, amplification, booster circuit, A/D Acquisition Circuit, single-chip microcomputer treatment circuit, D/A change-over circuit, V/I change-over circuit, reference circuit
The concrete connection of its circuit is as follows:
At the former limit of mutual inductor T1 resistance in series R21, the in parallel two-way transition of mutual inductor secondary suppresses diode CR1 and sampling resistor R1, secondary one end ground connection, the non-earth terminal of secondary inserts amplifier U5BMXL1013 negative input end by resistance R 2, insert the output terminal of U5B and the pipe leg 2 of single-chip microcomputer U6PIC16F73 by resistance R 3 simultaneously, reference voltage 5Vref is connected on the positive input terminal of U5B and arrives ground by resistance R 5 through divider resistance R4;
Connect the pipe leg 7 of the chip U8 X5043 that resets at the reseting pin 1 of single-chip microcomputer, a low level reset signal is provided, insert power supply VCC by pull-up resistor R6 simultaneously, pipe leg 1,4,5,6 ground connection, pipe leg 3,8 meets power supply VCC;
The pipe leg 5 of single-chip microcomputer U6 PIC16F73 meets reference voltage 5Vref, pipe leg 8 ground connection, pipe leg 9,10 connects crystal Y1 and two oscillatory circuits that capacitor C 4, C5 form, pipe leg 20 meets power supply VCC, pipe leg 19 ground connection, 19,20 shunt capacitance C6 of pipe leg, pipe leg 14,16 inserts power supply VCC by pull-up resistor R10, R11 respectively, and pipe leg 12,13,14,16 connects the pipe leg 13,8,7,6 of D/A conversion chip U7 respectively;
The pipe leg 14 of D/A conversion chip U7 meets power supply VCC, pipe leg 1 ground connection, and 1,14 shunt capacitance C7 of pipe leg, reference voltage 5Vref connect the resistance R 8, R9 of series connection to ground, and its mid point connects the pipe leg 2,3,4,5 of D/A conversion chip U7;
The pipe leg 12 of D/A conversion chip U7 connects the resistance R 12 of series connection, potentiometer W6, resistance R 22, capacitor C 9 is to ground, reference voltage 5Vref meets the potentiometer WZ of polyphone, the zeroing circuit that resistance R 13 is formed is to the tie point of potentiometer W6 and resistance R 22, the negative input end of U9A and connect operational amplifier U9A output terminal by resistance R 14, the positive input terminal ground connection of U9A,-15V is by the dropping resistor R24 of polyphone, R22 is to ground, R24, the R22 tie point and+15V provides voltage to U9A respectively, the output terminal of U9A connects the negative input end of U9B and passes through parallel resistor R17 by resistance R 15, capacitor C 8, connect the output terminal of U9B again with resistance R 9 polyphones, the output terminal of U9B connects the output terminal of electric current 4～20mA by resistance R 20, the output terminal of electric current 4～20mA is by the resistance R 18 of polyphone, R16 ground connection, resistance R 18, the tie point of R16 connects the positive input terminal of U9B.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02285976 CN2580535Y (en) | 2002-11-13 | 2002-11-13 | Voltage signal modulation circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02285976 CN2580535Y (en) | 2002-11-13 | 2002-11-13 | Voltage signal modulation circuit |
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| CN2580535Y true CN2580535Y (en) | 2003-10-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 02285976 Expired - Fee Related CN2580535Y (en) | 2002-11-13 | 2002-11-13 | Voltage signal modulation circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102735917A (en) * | 2012-07-10 | 2012-10-17 | 上海市电力公司 | Voltage acquisition circuit for digital signal processor (DSP) |
| CN103674797A (en) * | 2013-12-25 | 2014-03-26 | 南通大学 | Sensor for particulate matter concentration detection |
| CN104639078A (en) * | 2015-01-12 | 2015-05-20 | 南京亚派科技股份有限公司 | Simplified sampling conditioning circuit |
| CN107966095A (en) * | 2017-12-26 | 2018-04-27 | 李明俊 | A kind of its length detection control method and detecting and controlling system |
| TWI839303B (en) * | 2023-09-13 | 2024-04-11 | 立錡科技股份有限公司 | Switching dc-dc converter |
-
2002
- 2002-11-13 CN CN 02285976 patent/CN2580535Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102735917A (en) * | 2012-07-10 | 2012-10-17 | 上海市电力公司 | Voltage acquisition circuit for digital signal processor (DSP) |
| CN103674797A (en) * | 2013-12-25 | 2014-03-26 | 南通大学 | Sensor for particulate matter concentration detection |
| CN104639078A (en) * | 2015-01-12 | 2015-05-20 | 南京亚派科技股份有限公司 | Simplified sampling conditioning circuit |
| CN104639078B (en) * | 2015-01-12 | 2018-08-17 | 南京亚派科技股份有限公司 | A kind of over-sampling modulate circuit of simplification |
| CN107966095A (en) * | 2017-12-26 | 2018-04-27 | 李明俊 | A kind of its length detection control method and detecting and controlling system |
| CN107966095B (en) * | 2017-12-26 | 2024-03-01 | 李明俊 | Spring length detection control method and detection control system |
| TWI839303B (en) * | 2023-09-13 | 2024-04-11 | 立錡科技股份有限公司 | Switching dc-dc converter |
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